设a={1,2,3),b={4,5,6),则(a×b)•(a+b)=____.
0. 解析: 因为a×b易垂直于a,也垂直于b,所以 (a×b)•a=0,(a×b)•b=0,从而(a×b)•(a+b)=(a×b)•a+(a×b)•b=0.
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/428151.html
上一篇:Passage Four "In the beginning was Apple. Allthings were made by it; and without it was not anything made that was made. Iftechnophiles were to write their own Testament, these might be the openinglines. Apple's ability t
Passage Four "In the beginning was Apple. Allthings were made by it; and without it was not anything made that was made. Iftechnophiles were to write their own Testament, these might be the openinglines. Apple's ability t
下一篇:请编写方法 int countIntOfArray(double a[]),该方法的功能是返回非空数组中正数的个数
请编写方法 int countIntOfArray(double a[]),该方法的功能是返回非空数组中正数的个数